It's not outrage at Stallman's comments, but asking whether someone who is horrendously, gratuitously crass, offensive and insensitive of people's emotions should be "cheerleading" free software.
That wasn't the first time RMS had said something like that, but to say it to a fellow dev, when you're asking that person to fix someone else's bug, seems particularly unaware.
For sure, Asperger's or Autism explains it, but doesn't make it much easier to deal with.
See also RMS's disappointment at the developer busy with a new child - start here (http://thread.gmane.org/gmane.emacs.devel/36137)
His inability to understand people is distracting from the aims of FSF.